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    <title>Document</title>
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    <script>
        //1.构造函数
        function Person() {
            this.sayHi = function() {
                console.log('hi');
                
            }
        }
        //p1
        var p1 = new Person();
        p1.sayHi();

        var p2 = new Person();
        p2.sayHi();

        //p1 的 sayHi方法 和p2 的 sayHi方法是同一个方法吗？

        //验证p1.sayHi == p2.sayHi
        console.log(p1.sayHi == p2.sayHi);//false
        //现在没创建一个对象 就会多生成一个sayHi 方法，缺点占用比较多的内存
        
    </script>
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